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3 years ago

Plz answer these plz i failing math

Mathematics

2 answers:

victus00 [196]3 years ago

8 0

Gauge 4 I am pretty sure

Art [367]3 years ago

6 0

Let's call the grade on the final x. It counts double, so this is like five tests, two of which score x. The average is the sum of the 5 divided by 5, and that has to equal 80:

$80 = \frac 1 5( 94 + 68 + 88 + x + x)$

$400 = 250 + 2x$

$150 = 2x$

$x = 75$

Answer: 75

Check:

$\frac 1 5( 94 + 68 + 88 + 75 + 75 ) = \frac 1 5(400) = 80 \quad\checkmark$

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State the conclusion based on the results of the test. The standard deviationstandard deviation inin the pressure required to op

inysia [295]

Answer:

B. There is sufficient evidence that the mean of the pressure required to open a certain valve has changed.

Step-by-step explanation:

We make this conclusion based on these reasons:

We are told that the "null hypothesis was rejected" after the "manager feels that the pressure variability has changed., meaning the null hypothesis was the opposite of what occurred; that is to say, it is the alternate hypothesis that proved true instead.
"changes in the manufacturing process" form what can be called "sufficient evidence" that the mean of the pressure required to open the valve has changed, thereby going against the null hypothesis.

It is based on the above reasons that the null hypothesis was rejected.

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3 years ago

If log2 5 = k, determine an expression for log32 5 in terms of k.

lukranit [14]

Answer:

$log_3_2(5)=\frac{1}{5} k$

Step-by-step explanation:

Let's start by using change of base property:

$log_b(x)=\frac{log_a(x)}{log_a(b)}$

So, for $log_2(5)$

$log_2(5)=k=\frac{log(5)}{log(2)}\hspace{10}(1)$

Now, using change of base for $log_3_2(5)$

$log_3_2(5)=\frac{log(5)}{log(32)}$

You can express $32$ as:

$2^5$

Using reduction of power property:

$log_z(x^y)=ylog_z(x)$

$log(32)=log(2^5)=5log(2)$

Therefore:

$log_3_2(5)=\frac{log(5)}{5*log(2)}=\frac{1}{5} \frac{log(5)}{log(2)}\hspace{10}(2)$

As you can see the only difference between (1) and (2) is the coefficient $\frac{1}{5}$ :

So:

$\frac{log(5)}{log(2)} =k\\$

$log_3_2(5)=\frac{1}{5} \frac{log(5)}{log(2)} =\frac{1}{5} k$

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3 years ago

What is the surface area of the regular pyramid

Ugo [173]

Answer:

The answer is 144.

Step-by-step explanation:

Cause, 6 x 6 for the square is 36. For the triangle, 9 x 6 is 54, and 54 divided by 2 is 27. 27 x 4 is equal to 108. Now, we just add 108 and 36 to make 144.

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3 years ago

Alyssa drives 10 miles in 20 minutes. If she drove one hour in total at the same rate, how far did she go? i know the answer but

Fudgin [204]

Answer:

30 miles

Step-by-step explanation:

20 x 3 is 60 minutes

10 x 3 is 30 miles

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2 years ago

Write an equation in slope-intercept form for the line with slope -2 and y-intercept 5.

Nana76 [90]

Answer:

y = -2x + 5

Step-by-step explanation:

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3 years ago